Upper panel of the plot shows population-weighted high and low temperature for each day (note: day-1 has high temperature only). Lower panel shows the forecast electricity demand for the service area of the company, in percentage of the normal demand expected under normal weather conditions during this 7-day period.
as observed at Columbus, Columbus Municipal Airport
About Cornhusker PPD (NE): Serving nearly 9,000 customers in rural portions of Platte, Colfax, Boone, Nance, Greeley and Wheeler counties (see website)